docs: def setup(self, ds):
          """
          Initialize various special variable types within the class.
          Mutates a number of instance variables.
  
          :param netCDF4.Dataset ds: An open netCDF dataset
          """
          self._find_coord_vars(ds)
          self._find_aux_coord_vars(ds)
          self._find_ancillary_vars(ds)
          self._find_clim_vars(ds)
          self._find_boundary_vars(ds)
          self._find_metadata_vars(ds)
          self._find_cf_standard_name_table(ds)
          self._find_geophysical_vars(ds)